# US 9,434,860 B2 · Adhesive film for polarizing plate, adhesive composition for the same, polarizing plate comprising the same and optical display comprising the same

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- Number: US 9,434,860 B2
- Document ID: US9434860B2
- Status: Granted
- Kind: B2
- Application number: 14/700,041
- Filed: 2015-04-29
- Published: 2015-11-05
- Granted: 2016-09-06
- Earliest claimed: 2014-04-30
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Mi Yeon Yu; Yoo Jin Suh; Do Heon Lee; Seung Hoon Lee; Tae Hyun Lee; Ri Ra Jung; Woo Jin Jeong; In Cheon Han
- Web page: https://patentgrep.com/patent/US9434860B2

## CPC

- C09J 7/10: without carriers
- C08L 63/00: Compositions of epoxy resins; Compositions of derivatives of epoxy resins
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- C09J 163/00: Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
- C09J 4/00: Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16}
- C09J 133/06: of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J 2203/318: for the production of liquid crystal displays
- C09J 2301/312: parameters being the characterizing feature
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2463/00: Presence of epoxy resin
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An adhesive composition for a polarizing plate, an adhesive film formed from the same, a polarizing plate including the same, and an optical display including the same are disclosed. The adhesive film for a polarizing plate is formed from an adhesive composition including an epoxy compound and a (meth)acrylate compound, and the adhesive film has an FT-IR peak ratio of about 0.015 or lower as defined by Equation 1. Equation 1 FT-IR peak ratio=B/A (1) In Equation 1, A is the peak height of the peak attributable to the —(C═O)— bond at 1724 cm−1, and B is the peak height of the peak attributable to the —CH═CH— bond at 1636 cm−1.

## Claims

### Claim 1

An adhesive film for a polarizing plate, the adhesive film being formed from an adhesive composition for a polarizing plate comprising an epoxy component and a (meth)acrylate component, the epoxy component comprising a first epoxy compound having a first glass transition temperature and a second epoxy compound having a second glass transition temperature, the second glass transition temperature being different from the first glass transition temperature by 50° C. or more, wherein the adhesive film has an FT-IR peak ratio of about 0.015 or lower as defined by Equation 1:
Equation 1
FT-IR peak ratio=B/A (1),
wherein A is a peak height attributable to a —(C═O)— bond at 1724 cm−1 and B is a peak height attributable to a —CH═CH— bond at 1636 cm−1.

### Claim 2 (depends on 1)

The adhesive film according to claim 1, wherein the adhesive film has a glass transition temperature of about 55° C. to about 105° C.

### Claim 3 (depends on 1)

The adhesive film according to claim 1, wherein a weight ratio of the epoxy component to the (meth)acrylate component in the adhesive composition is greater than about 1.

### Claim 4 (depends on 1)

The adhesive film according to claim 1, wherein the first glass transition temperature is about 0° C. to about 150° C. and the second glass transition temperature is about 50° C. to about 200° C.

### Claim 5 (depends on 1)

The adhesive film according to claim 1, wherein the first epoxy compound comprises an epoxy compound containing one aromatic group; and the second epoxy compound comprises at least one of an epoxy compound containing at least two aromatic groups, an alicyclic epoxy compound, a hydrogenated epoxy compound, or an aliphatic epoxy compound.

### Claim 6 (depends on 5)

The adhesive film according to claim 5, wherein the first epoxy compound comprises at least one of phenyl glycidyl ether, resorcinol diglycidyl ether, or butylphenyl glycidyl ether.

### Claim 7 (depends on 1)

The adhesive film according to claim 1, wherein the adhesive composition further comprises a photosensitizer and a photocationic polymerization initiator.

### Claim 8 (depends on 7)

The adhesive film according to claim 7, wherein the adhesive composition comprises:
about 0.1 parts by weight to about 10 parts by weight of the photosensitizer based on a total of 100 parts by weight of a sum of about 40 wt % to about 90 wt % of the epoxy component and about 10 wt % to about 60 wt % of the (meth)acrylate component in terms of solids content; and
about 0.1 parts by weight to about 10 parts by weight of the photocationic polymerization initiator based on a total of 100 parts by weight of a sum of about 40 wt % to about 90 wt % of the epoxy component and about 10 wt % to about 60 wt % of the (meth)acrylate component in terms of solids content.

### Claim 9 (depends on 1)

The adhesive film according to claim 1, wherein the first epoxy compound is present in the epoxy component in an amount of about 1 wt % to about 30 wt %, and the second epoxy compound is present in the epoxy component in an amount of about 70 wt % to about 99 wt %.

### Claim 10 (depends on 1)

The adhesive film according to claim 1, wherein the (meth)acrylate component comprises a hydroxyl group-containing monofunctional acrylate.

### Claim 11 (depends on 10)

The adhesive film according to claim 10, wherein the (meth)acrylate component further comprises a C1 to C10 alkyl group-containing (meth)acrylate substituted with a C6 to C10 aryloxy group.

### Claim 12 (depends on 1)

A polarizing plate, comprising the adhesive film for a polarizing plate according to claim 1.

### Claim 13 (depends on 12)

An optical display, comprising the polarizing plate according to claim 12.